Grinding attachment for power-machines.



"Patented July l, 1902.

R E T L A W o H W Fm.

GRINDING ATTACHMENT FOR POWER MACHINES,

(Application filed. Feb. 19, 1902.)

(No Model.)

UNITED STATES V PATENT OFF- ce.

GRINDING ATTACHMENT FOR POWER-MACHINES.

SPECIFICATION forming part of Letters Patent No.7o3,4se, dated July 1,1902.

Application filed'li'ebruary 19, 1902. Serial No. 94,888. (No model.)

To all whom, it may concern:

Be it known that I, ERASMUS W. SHowAL- TER, a citizen of the United statesy'residing' at Olaypool, in the county of Kosciusko and State of Indiana, have invented a new and useful Grinding Attachment for Power-Machines, of which the following is a specification.

This invention relates to an improved grind ing attachment forpower-machines, and is especially adaptedfor use in connection with sewingma chines. 1

The object of the invention is to provide a detachable device for attachment to the tables of power-machines, particularly to sewing-machine tables, whereby scissors and other edged tools may be rapidly sharpened by an unskilled person.

Another object is to provide a device of this character which is simple, inexpensive, and convenientlymanipulated and which has an improved supporting-standard adapted to act as a spring tension for the driving-wheel and to thereby cause it to run smooth and easy.

Still another object is to provide a detachable guard which is simple in construction and which is capable oflexp'editious manipulation in its application to'a'ndremoval from the grinder, requiring no binding-screws" or like devices for securing it in placefa'nd which is adapted to perform the double func: tion of a guard and a lock for holding the roller-carrying shaft against accidentaloutriding from the open slot in one of'the yokearms. V

In the accompanyin'g'drawings, Figure l is a perspective view showing my improved device applied to a sewing-machine in position for operation. Fig. 2 isa-perspective view showing the device detached and with the guard in position for operation upon the yoke or frame of the device. Fig. 3 is a vertical sectional View taken through the yoke or frame and the end of the supporting-standard and through the guard, the latter being shown in operative position and the shaft, with the grinding-roller and pulley, being shown in elevation. In this view dotted-lines are used for indicating the guard when the latter is withdrawn from engagement with the frame. Fig. 4. is a side View, a portion of the support having been broken away. Fig. 5 is a' perspective detail view of the guard.

Similar reference-numerals indicate corresponding parts in all the figures.

Referring to the drawings, 1 designates the supporting-standard, which is preferably made S shaped and is composed of sheet metal, which gives it a springy action, for a purpose hereinafter to be described. This standard 1 has a longitudinal open slot 2 in the lower end thereof, which permits of its adjustment to a machine-table by means of a set-screw 3, which passes through the slot and engages a screw-hole in the machine-table disposed at one end of the table adjacent to the driving-wheel.

A yoke is attached to the upper end of the standard 1 by a suitable fastener, preferably a rivet, and is adapted to support the grinding-roller 20,hereinafter to be described. This yoke 10 is preferably maderectangular, the arms thereof being flat. The arm 11 of the yoke isprovided with an aperture 12 for receiving one end of a grinder-carrying shaft 30, soon to be described, and the arm 13 thereof has an upwardly-extending oblique open slot 14 therein for receiving the other end of the sha'ft30, the aperture 12 and the slot 14 forming bearings for the shaft 30.

The grinding-roller 20, which may be of any suitable construction and which is preferably a vitrified emery-wheel, is immovably mounted on the shaft 30, near the outer end thereof, and a friction-wheel 40 is rigidly connected to the inner end of said shaft, leaving a space between it and the roller 20. This friction-wheel 40 is preferably made of wood covered with rubber and on being disposed in contact with a driving-wheel causes the shaft carrying the grinder to rotate, thereby giving power and preventing noise. The

outer projecting end of the shaft 30 is inserted in" the aperture 12 of the arm 11 of the yoke 10, and the arm 13 of the yoke is inserted between the grinder and the friction-wheel 40, the shaft being slipped into the slot 14 thereof. p v v A guard is removably,attachedgto the arm 13 and is preferably made of atlat strip of metal, Whichisbent' to fo'rina downwardly extending .member '51,'provided with'an open slot 52 at its lower end and having oppositely disposed inwardly-bent edges 53 and 54, formiugguideways 55 and 56 for engaging the edges of the arm 13. This metal strip is bent outwardly at an angle to the member 51, preferably at right angles, forming an approximately horizontal member 57, which has an upwardly-bent terminal 58, which forms the guard or rest for scissors to be ground. This guard is attached to the grinder by slipping it over the arm 13, with the guideways and 56 engaging the edges of said arm and with its horizontal member 57 extending over and parallel with the face of the roller 20. This guard performs the double function of a guard and of a retaining means or lock for preventing the shaft 30 from riding out of the open slot 14 in the arm 13 when in operation. When it is desired to use the entire grinding-surface of the roller 20, the guard 50 may be quickly and easily slipped off and the roller used without it, it being again applied when desired.

In the use of this device it is attached to the table of a machine, as shown in Fig. 1, with the friction-wheel 4O engaging the driving-wheel of the machine, which imparts r0- tary motion to the shaft 30, carrying the grinding-roller 20. The grinder may be adjusted to or from the driving-wheel any desired distance by means of the slot 2 and the sot-screw 3, and the standard 1 being made of sheet metal has a spring action which when adjusted against the driving-wheel tends to act as a spring tension for said wheel and causes it to run smooth and easy.

The device may be removed when desired and put out of the way when the machine is desired for other uses.

I claim as my invention- 1. The combination of the yoke having an oblique open slot in one of its arms and an aperture in the other arm, a shaft journaled in said aperture and slot and carryinga grinding-roller and a friction-wheel, and a guard having bent edges slidingly engaging one arm v of the yoke.

of the yoke and provided with a Vertical slot to receive the shaft.

8. A grinding attachment for power-machines comprisingasupporting-standard having oppositely-disposed vertical arms at its upper end, a grinding-roller mounted detachably in said arms, said roller having a friction-wheel connected therewith for engaging a driving-wheel, and a detachable guard slidably mounted on one of said arms.

4:. A grinding attachment for power-machines comprisingasupporting-standardhaving vertical arms at its upper end, a grindingroller mounted in said arms and provided with means for engaging a driving-wheel, and a detachable guard slidablymountedon one ofsaid arms and having a member extending horizontally over said grinding-roller and provided with an upwardly-extending arm at its free end.

5. A grinding attachment for power-niachines comprising a supporting-standard having upwardly-extending fiat arms, a grinding-roller mounted in said arms, and a detachable guard provided with guideways for engaging one of said arms.

(5. A grinding attachment for power-machines,comprisingasupporting-standardhaving an open slot at one end thereof and an inverted yoke disposed at the other end, the arms of said yoke being flat and provided with means for detachably receiving a shaft, a shaft carrying a grinding-roller mounted in said means, and a detachable guard provided with inwardly-bent edges forming guideways for engaging the edges of one of said arms.

7. A detachable guard for a grinding attachment comprising avertical member having means for engaging a supporting-standard and a horizontally-disposed member attached to said vertical member at its upper end, said horizontal member having an upwardly-extending arm at its free end.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

ERASMUS W. SIIOYVALTER.

\Vitnesses:

ALVIN A. MENDEL, E. W. KINSEY. 

